According to History, the Holy Bible contains some of the first documented examples of why Friday and/or the number 13 may be unlucky. Naturally, there are no specific mentions of Friday the 13th in the Bible, but the Last Supper did take place on Maundy Thursday with a total of 13 people — Jesus Christ and his 12 apostles — gathered around the table. Jesus was betrayed by Judas Iscariot, the 13th guest to the Last Supper, and was crucified the next day, which was Good Friday. This led to the Christian superstition that it's bad luck to have 13 guests at a table, as doing so would potentially result in someone's death.
Is it possible, though, that Jesus died on Friday the 13th? As explained by Britannica, data from the Gospels of Matthew, Mark, and Luke suggests that he may have been crucified on what we now know as April 7 on the Gregorian calendar. But since Good Friday is now commemorated on a flexible date that falls between March 20 and April 23, there are — and will be — times when it could fall specifically on Friday, April 13.
Furthermore, the book of Genesis features a couple of tragic events that purportedly happened on a Friday. These include the day when Adam and Eve angered God by taking an apple from the Tree of Knowledge, and the day when Adam's firstborn, Cain, murdered his younger brother Abel.
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